Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 115)

IM 11M13A01-02E 7-16
(3) Follow the display message in Figure 7.19 to turn on span gas flow. Open the span-
gas flow valve for the Flow Setting Unit by loosening the valve lock-nut and slowly
turning the valve shaft counterclockwise to flow the span gas at 600 ml/min.
±
60
ml/min. Use the calibration gas flowmeter to check the flow.
Enter
Open span gas valve.
Set flow span gas to
600ml/min.
Valve opened
᭜ Cancel calibration
Manual calibration
F7.19E.EPS
Enter
21.00%
0.5min./div
1.00%
21.0 %O2 CAL. TIME
Manual calibration
F7.20E.EPS
Figure 7.19 Span-gas Flow Display Figure 7.20 Manual Calibration Trend Graph
(for Manual Calibration)
(4) If “Valve opened” is selected as in Figure 7.19 , an oxygen-concentration trend graph
(with the oxygen concentration being measured) appears (see Figure 7.20). The CAL
TIME in the bottom area of the panel flashes. Observe the trend graph and wait until
the measured value stabilizes in the vicinity of 21 percent on the graph. At this point,
calibration has not yet been executed yet, so even if the measured value is above or
below 21 percent, no problem occurs.
(5) After the measured value has stabilized, press the [Enter] key to display the “span-
calibration complete” display shown in Figure 7.21. At that point, the measured
value is corrected to equal the span-gas concentration setting. Close the span-gas
flow valve. The valve lock-nut should be tightened completely so that the span gas
does not leak.
Enter
Span calibration
Close the span gas valve.
Zero calibration
᭜ End
Manual calibration
F7.21E.EPS
Enter
Check the zero gas
concentration value
Next
᭜ Cancel calibration
᭜ Change value: 1.00%
Manual calibration
F7.22E.EPS
Figure 7.21 Span Calibration Figure 7.22 Zero-gas Concentration
Complete Zero calibration Check Display
start Display (in Manual Calibration)
(6) Select Zero calibration as in Figure 7.21 to display the zero-gas concentration check
display (Manual calibration) . Check that the zero-gas oxygen concentration value
and the calibration gas oxygen concentration value agree. Then select Next as in
Figure 7.22.